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A java Applet doesn't have the capability to manipulate the browser.
To achieve the functionality we want, basically we need to develop plugins for different browsers. Different terms are used for different browser
IE - Add-ons
Chrome - Extensions
Firefox - All following terms are used "Add-ons, Plug-in, Extension", for your requirement, could be Add-on
Safari - Extensions
The functionality we require is simple, but to develop plug-ins for all above browser, different skills sets are required, and it is usually not easy to find a person that knows all of them.
Maybe we will need to employ different freelancers for different plugins, but we think it may be better to have one done first, and then we can have others look at the completed one for reference.